The Las Vegas-based promotion confirmed the matchup on Wednesday.
UFC 199 takes place at the Forum in Los Angeles on June 4 and is
headlined by a middleweight title rematch between Luke
Rockhold and Chris
Weidman. In the co-main event, Dominick
Cruz defends his bantamweight strap against Urijah Faber
for a second time.

Casey, 34, is coming off a third-round technical knockout loss to
Rafael
Natal at UFC on Fox 18 in his last outing. “King” has won just
once in five Octagon appearances, with two of his bouts resulting
in no contests. His lone victory came against Ildemar
Alcantara at UFC Fight Night “Mir vs. Duffee” last July.

A former Maximum Fighting Championship titlist, Mutapcic made his
promotional debut on short notice, falling to Francimar
Barroso via unanimous decision at UFC Fight Night in Boston on
Jan. 17. The 29-year-old is 15-4 in his professional career.